Telephone transmitter



A. ,E- COY.

TELEPHONE TRANSMITTER.

APPLICATION FILED MAR. 20, 1920.

Patented Jan. 17 1922.'

.ALBERT E. COY, 0F CHICAGO, ILLINOIS.

TELEPHONE TRANSMITTER.

Specification of Letters Patent.

Patented Jan. 17, 1922.

Application filed March 20, 1920. Serial No..367,560. f

To all whom it may concern:

Be it known that I, ALBERT E. Cor, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Telephone Transmitters, of which the following is a. specification.

The invention relates to improvements in portable telephone transmitters.

One of the objects of the invention is to provide an improved instrument for use with a sound amplifying system to be used by persons who are partially deaf.

Another object is to provide an improved means for mechanically connecting the transmitter with a case enclosing the standard battery and adapting the electric terminals of a transmitter toreo-operation with, the contact terminals of a standard battery.

Another object is to improve the transmitter casing to increase the sensitiveness and clearne of transmission.

Another object is to provide an improved form of transmitter casing especially adaptable for a battery casing of standard form. Another object is to provide a new and improved form of cover, or closure, for the transmitter, providing an air chamber of peculiar character between the diaphragm and the inner lsurface of the cover, and providing a means for concentrating the sound waves that impinge upon. the cover nea-r the center thereof.

Other, further and more specific objects of the invention will become more readily apparent, to persons skilled in the art, from a consideration of the following description, when taken in conjunction with the drawings, wherein Fig. 1 is a front view of the instrument with the battery-containing casing open, showing a two cell dry battery of standard make therein.

In all the views the same reference characters are employed to indicate similar p-arts. Y

10 is a casing or container for a battery 11. The battery may contain a plurality of cells, such as 12 and 13. The container is oval in shape to correspond with the transverse sectional outline of the battery and is hinged, preferably, at one of its sides, as at 14, with a cover, or closure 15, and is provided with snap members 16 and 17 to latch the cover or closure to the container 10. The battery box, or container, similar in general outline to that described, is used with the standard battery 11.

In the disclosed embodiment, to one end, to-wit: end 18, 'the transmitter casing 19 is secured. The transmitter basing, preferably, round in outline is providedl with a lateral projection 20. Itis provided also with a roundo-r circular top, or cover 21, that is secured to the casing by screw threaded engagement .22, as usual in devices of this character.

The part 20 of the transmitter casing is flat on its bottom surface, as at 23, for directx support upon the flat end wall 18, of the battery casing 10.A

The transmitter casing 19, contains a carbon disk 24, and a solid back button -25 'is lsup-ported in the casing by a metallic structure consisting of the strip 26, and screws 27.

The projecting portion 20, of the transmitter casing, is provided with two spacedapart threaded tubes 28 and 29. The transmitter disk is connected by a wire 41 lthat leads t0 a receiver and the button 25 is coning by an insulating disk 37 and it supports Y a spring blade contact 38 for cooperation with a similar blade contact 39 of the stand and battery 11, s0 that when the battery 11 is placed within its casing 10, the terminal 40, of the battery, makes spring yielding contact with the spring blade 35, and the terminal 39, of the battery, makes similar contact with the blade 38 thereby completing the circuit through the battery by the act of placing the battery in its casing.

Two circuit wires from the transmitter of the system, wires 41 and 42, pass through' an opening 43, made in the projecting portion 20 of the transmitter casing. rThis opening is between the back of the transmitter casing and the cover 21 and below the cover. The wire 41 is connected to the diaphragm 24, While the wire 42 is connected to the screw 33. By this means the carbon button and diaphragm of the transmitter is connected properly to the wires 41 and 42 that lead to the receiver.

The cover 21 is provided with a concave wall 44 having a A central perforated zone 45, surrounded by an annular `ring-like structure 46 projecting from the inset portion of the Wall to the front of the instrument. This wall, 46, has a tendency to concentrate the sound waves that impinge upon the cover or closure 21, and to direct them more forcibly against the underlying diaphragm. The

lStructure also provides a peculiar sound chamber 47, being deeper near its periphery than its central portion. For reasons for which I cannot account, the peculiar form of the chamber enhances the operative effectiveness of the instrument, rendering the transmission more sharply and distinctly4 effective.

The entire structure is-devoid of outside f terminals, screws and contacts, that render such devices so objectionable for general use for the purpose for which this instrument is intended.

While I haveherein shown a single embodiment of my invention, it will be manifest to persons skilled in the art,'that many changes may be made in the general arrangement and configuration of the parts within the scope of the appended claims.

Having described my, invention what I claim as new and desire to secure by Letters Patent is :--v

1. In combination a transmitter casing j ection and conductors .passing through said opening into the transmitter casing.

2. In a device of the character described,

a generally round transmitter casing with a lateral integral projection terminating in a substantially fiat surface; a battery casing having a substantially fiat contacting end wall; two spaced-apart screw threaded terminal members, extending through said projection to the contacting wall; a terminal plate for each member, within the battery casing, adapted for connection with the terminals of a standard battery, by the act of placing said battery in the casing'and clamping means engaging the threaded terminals to hold the casings together.

3. In a device of the character described the combination of a telephone transmitter casing and an attached battery casing, the transmitter casing being generally round in outline and having a lateralintegral projection for support on the battery casing; two threaded conducting members passing through said projection to the adjacent wall of said battery casing for connection with terminals in the interior thereof; means, cooperating with said members to hold the casing together and clamping means within the respective casings to include said members in circuit;

In testimony whereof I hereun'to subscribed my name.

ALBERT E. COY. 

